UV unwrapping problem with image mapping
Hmmm .... There is a perspective problem (the perspective of the image and the Projected View don't match) and I think I should solve that problem in Photoshop. When I export the UV layout after UV unwrapping I can correct the perspective of the image in Photoshop (with the WARP tool) so that the image fits with the UV layout.



I think Cegaton is right with his comment (camera perspective in Blender and image perspective don't match) but correcting the perspective of the image in Photoshop does the job pretty good.

There seems to be a Blender Addon named BLAM that helps to solve this kind of challenges (thanks Cegaton).